Income Taxes - Schedule of Reconciliation of Statutory Federal Income Taxes to Effective Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Tax at statutory federal rate	$ (306,470)	$ (99,622)	$ (25,001)
State tax, net of federal benefit	525	257	178
Nondeductible expenses	16,711	15,238	733
Foreign income rate differential	172,259	86,734	(253)
U.S. tax credits	(43,911)	(26,895)	(6,682)
Other reconciling items	1,232	877	1,317
Change in valuation allowance	172,693	32,815	32,296
Provision for income taxes	$ 13,039	$ 9,404	$ 2,588